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revision 1394 by ph10, Sat Nov 9 09:17:20 2013 UTC revision 1495 by ph10, Sat Jul 12 18:22:54 2014 UTC
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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4  Version 8.34 xx-xxxx-201x  Version 8.36 xx-xxx-2014
5    ------------------------
6    
7    1.  Got rid of some compiler warnings in the C++ modules that were shown up by
8        -Wmissing-field-initializers and -Wunused-parameter.
9    
10    2.  The tests for quantifiers being too big (greater than 65535) were being
11        applied after reading the number, and stupidly assuming that integer
12        overflow would give a negative number. The tests are now applied as the
13        numbers are read.
14    
15    3.  Tidy code in pcre_exec.c where two branches that used to be different are
16        now the same.
17    
18    4.  The JIT compiler did not generate match limit checks for certain
19        bracketed expressions with quantifiers. This may lead to exponential
20        backtracking, instead of returning with PCRE_ERROR_MATCHLIMIT. This
21        issue should be resolved now.
22    
23    5.  Fixed an issue, which occures when nested alternatives are optimized
24        with table jumps.
25    
26    6.  Inserted two casts and changed some ints to size_t in the light of some
27        reported 64-bit compiler warnings (Bugzilla 1477).
28    
29    7.  Fixed a bug concerned with zero-minimum possessive groups that could match
30        an empty string, which sometimes were behaving incorrectly in the
31        interpreter (though correctly in the JIT matcher). This pcretest input is
32        an example:
33    
34          '\A(?:[^"]++|"(?:[^"]*+|"")*+")++'
35          NON QUOTED "QUOT""ED" AFTER "NOT MATCHED
36    
37        the interpreter was reporting a match of 'NON QUOTED ' only, whereas the
38        JIT matcher and Perl both matched 'NON QUOTED "QUOT""ED" AFTER '. The test
39        for an empty string was breaking the inner loop and carrying on at a lower
40        level, when possessive repeated groups should always return to a higher
41        level as they have no backtrack points in them. The empty string test now
42        occurs at the outer level.
43    
44    8.  Fixed a bug that was incorrectly auto-possessifying \w+ in the pattern
45        ^\w+(?>\s*)(?<=\w) which caused it not to match "test test".
46    
47    9.  Give a compile-time error for \o{} (as Perl does) and for \x{} (which Perl
48        doesn't).
49    
50    10. Change 8.34/15 introduced a bug that caused the amount of memory needed
51        to hold a pattern to be incorrectly computed (too small) when there were
52        named back references to duplicated names. This could cause "internal
53        error: code overflow" or "double free or corruption" or other memory
54        handling errors.
55    
56    11. When named subpatterns had the same prefixes, back references could be
57        confused. For example, in this pattern:
58    
59          /(?P<Name>a)?(?P<Name2>b)?(?(<Name>)c|d)*l/
60    
61        the reference to 'Name' was incorrectly treated as a reference to a
62        duplicate name.
63    
64    12. A pattern such as /^s?c/mi8 where the optional character has more than
65        one "other case" was incorrectly compiled such that it would only try to
66        match starting at "c".
67    
68    13. When a pattern starting with \s was studied, VT was not included in the
69        list of possible starting characters; this should have been part of the
70        8.34/18 patch.
71    
72    14. If a character class started [\Qx]... where x is any character, the class
73        was incorrectly terminated at the ].
74    
75    15. If a pattern that started with a caseless match for a character with more
76        than one "other case" was studied, PCRE did not set up the starting code
77        unit bit map for the list of possible characters. Now it does. This is an
78        optimization improvement, not a bug fix.
79    
80    16. The Unicode data tables have been updated to Unicode 7.0.0.
81    
82    17. Fixed a number of memory leaks in pcregrep.
83    
84    18. Avoid a compiler warning (from some compilers) for a function call with
85        a cast that removes "const" from an lvalue by using an intermediate
86        variable (to which the compiler does not object).
87    
88    19. Incorrect code was compiled if a group that contained an internal recursive
89        back reference was optional (had quantifier with a minimum of zero). This
90        example compiled incorrect code: /(((a\2)|(a*)\g<-1>))*/ and other examples
91        caused segmentation faults because of stack overflows at compile time.
92    
93    
94    Version 8.35 04-April-2014
95  --------------------------  --------------------------
96    
97    1.  A new flag is set, when property checks are present in an XCLASS.
98        When this flag is not set, PCRE can perform certain optimizations
99        such as studying these XCLASS-es.
100    
101    2.  The auto-possessification of character sets were improved: a normal
102        and an extended character set can be compared now. Furthermore
103        the JIT compiler optimizes more character set checks.
104    
105    3.  Got rid of some compiler warnings for potentially uninitialized variables
106        that show up only when compiled with -O2.
107    
108    4.  A pattern such as (?=ab\K) that uses \K in an assertion can set the start
109        of a match later then the end of the match. The pcretest program was not
110        handling the case sensibly - it was outputting from the start to the next
111        binary zero. It now reports this situation in a message, and outputs the
112        text from the end to the start.
113    
114    5.  Fast forward search is improved in JIT. Instead of the first three
115        characters, any three characters with fixed position can be searched.
116        Search order: first, last, middle.
117    
118    6.  Improve character range checks in JIT. Characters are read by an inprecise
119        function now, which returns with an unknown value if the character code is
120        above a certain treshold (e.g: 256). The only limitation is that the value
121        must be bigger than the treshold as well. This function is useful, when
122        the characters above the treshold are handled in the same way.
123    
124    7.  The macros whose names start with RAWUCHAR are placeholders for a future
125        mode in which only the bottom 21 bits of 32-bit data items are used. To
126        make this more memorable for those maintaining the code, the names have
127        been changed to start with UCHAR21, and an extensive comment has been added
128        to their definition.
129    
130    8.  Add missing (new) files sljitNativeTILEGX.c and sljitNativeTILEGX-encoder.c
131        to the export list in Makefile.am (they were accidentally omitted from the
132        8.34 tarball).
133    
134    9.  The informational output from pcretest used the phrase "starting byte set"
135        which is inappropriate for the 16-bit and 32-bit libraries. As the output
136        for "first char" and "need char" really means "non-UTF-char", I've changed
137        "byte" to "char", and slightly reworded the output. The documentation about
138        these values has also been (I hope) clarified.
139    
140    10. Another JIT related optimization: use table jumps for selecting the correct
141        backtracking path, when more than four alternatives are present inside a
142        bracket.
143    
144    11. Empty match is not possible, when the minimum length is greater than zero,
145        and there is no \K in the pattern. JIT should avoid empty match checks in
146        such cases.
147    
148    12. In a caseless character class with UCP support, when a character with more
149        than one alternative case was not the first character of a range, not all
150        the alternative cases were added to the class. For example, s and \x{17f}
151        are both alternative cases for S: the class [RST] was handled correctly,
152        but [R-T] was not.
153    
154    13. The configure.ac file always checked for pthread support when JIT was
155        enabled. This is not used in Windows, so I have put this test inside a
156        check for the presence of windows.h (which was already tested for).
157    
158    14. Improve pattern prefix search by a simplified Boyer-Moore algorithm in JIT.
159        The algorithm provides a way to skip certain starting offsets, and usually
160        faster than linear prefix searches.
161    
162    15. Change 13 for 8.20 updated RunTest to check for the 'fr' locale as well
163        as for 'fr_FR' and 'french'. For some reason, however, it then used the
164        Windows-specific input and output files, which have 'french' screwed in.
165        So this could never have worked. One of the problems with locales is that
166        they aren't always the same. I have now updated RunTest so that it checks
167        the output of the locale test (test 3) against three different output
168        files, and it allows the test to pass if any one of them matches. With luck
169        this should make the test pass on some versions of Solaris where it was
170        failing. Because of the uncertainty, the script did not used to stop if
171        test 3 failed; it now does. If further versions of a French locale ever
172        come to light, they can now easily be added.
173    
174    16. If --with-pcregrep-bufsize was given a non-integer value such as "50K",
175        there was a message during ./configure, but it did not stop. This now
176        provokes an error. The invalid example in README has been corrected.
177        If a value less than the minimum is given, the minimum value has always
178        been used, but now a warning is given.
179    
180    17. If --enable-bsr-anycrlf was set, the special 16/32-bit test failed. This
181        was a bug in the test system, which is now fixed. Also, the list of various
182        configurations that are tested for each release did not have one with both
183        16/32 bits and --enable-bar-anycrlf. It now does.
184    
185    18. pcretest was missing "-C bsr" for displaying the \R default setting.
186    
187    19. Little endian PowerPC systems are supported now by the JIT compiler.
188    
189    20. The fast forward newline mechanism could enter to an infinite loop on
190        certain invalid UTF-8 input. Although we don't support these cases
191        this issue can be fixed by a performance optimization.
192    
193    21. Change 33 of 8.34 is not sufficient to ensure stack safety because it does
194        not take account if existing stack usage. There is now a new global
195        variable called pcre_stack_guard that can be set to point to an external
196        function to check stack availability. It is called at the start of
197        processing every parenthesized group.
198    
199    22. A typo in the code meant that in ungreedy mode the max/min qualifier
200        behaved like a min-possessive qualifier, and, for example, /a{1,3}b/U did
201        not match "ab".
202    
203    23. When UTF was disabled, the JIT program reported some incorrect compile
204        errors. These messages are silenced now.
205    
206    24. Experimental support for ARM-64 and MIPS-64 has been added to the JIT
207        compiler.
208    
209    25. Change all the temporary files used in RunGrepTest to be different to those
210        used by RunTest so that the tests can be run simultaneously, for example by
211        "make -j check".
212    
213    
214    Version 8.34 15-December-2013
215    -----------------------------
216    
217  1.  Add pcre[16|32]_jit_free_unused_memory to forcibly free unused JIT  1.  Add pcre[16|32]_jit_free_unused_memory to forcibly free unused JIT
218      executable memory. Patch inspired by Carsten Klein.      executable memory. Patch inspired by Carsten Klein.
219    
220  2.  ./configure --enable-coverage defined SUPPORT_GCOV in config.h, although  2.  ./configure --enable-coverage defined SUPPORT_GCOV in config.h, although
221      this macro is never tested and has no effect, because the work to support      this macro is never tested and has no effect, because the work to support
222      coverage involves only compiling and linking options and special targets in      coverage involves only compiling and linking options and special targets in
223      the Makefile. The comment in config.h implied that defining the macro would      the Makefile. The comment in config.h implied that defining the macro would
224      enable coverage support, which is totally false. There was also support for      enable coverage support, which is totally false. There was also support for
225      setting this macro in the CMake files (my fault, I just copied it from      setting this macro in the CMake files (my fault, I just copied it from
226      configure). SUPPORT_GCOV has now been removed.      configure). SUPPORT_GCOV has now been removed.
227    
228  3.  Make a small performance improvement in strlen16() and strlen32() in  3.  Make a small performance improvement in strlen16() and strlen32() in
229      pcretest.      pcretest.
230    
231  4.  Change 36 for 8.33 left some unreachable statements in pcre_exec.c,  4.  Change 36 for 8.33 left some unreachable statements in pcre_exec.c,
232      detected by the Solaris compiler (gcc doesn't seem to be able to diagnose      detected by the Solaris compiler (gcc doesn't seem to be able to diagnose
233      these cases). There was also one in pcretest.c.      these cases). There was also one in pcretest.c.
234    
235  5.  Cleaned up a "may be uninitialized" compiler warning in pcre_exec.c.  5.  Cleaned up a "may be uninitialized" compiler warning in pcre_exec.c.
236    
237  6.  In UTF mode, the code for checking whether a group could match an empty  6.  In UTF mode, the code for checking whether a group could match an empty
238      string (which is used for indefinitely repeated groups to allow for      string (which is used for indefinitely repeated groups to allow for
# Line 31  Version 8.34 xx-xxxx-201x Line 241  Version 8.34 xx-xxxx-201x
241      data item and had a minimum repetition of zero (for example, [^\x{100}]* in      data item and had a minimum repetition of zero (for example, [^\x{100}]* in
242      UTF-8 mode). The effect was undefined: the group might or might not be      UTF-8 mode). The effect was undefined: the group might or might not be
243      deemed as matching an empty string, or the program might have crashed.      deemed as matching an empty string, or the program might have crashed.
244    
245  7.  The code for checking whether a group could match an empty string was not  7.  The code for checking whether a group could match an empty string was not
246      recognizing that \h, \H, \v, \V, and \R must match a character.      recognizing that \h, \H, \v, \V, and \R must match a character.
247    
248  8.  Implemented PCRE_INFO_MATCH_EMPTY, which yields 1 if the pattern can match  8.  Implemented PCRE_INFO_MATCH_EMPTY, which yields 1 if the pattern can match
249      an empty string. If it can, pcretest shows this in its information output.      an empty string. If it can, pcretest shows this in its information output.
250    
251  9.  Fixed two related bugs that applied to Unicode extended grapheme clusters  9.  Fixed two related bugs that applied to Unicode extended grapheme clusters
252      that were repeated with a maximizing qualifier (e.g. \X* or \X{2,5}) when      that were repeated with a maximizing qualifier (e.g. \X* or \X{2,5}) when
253      matched by pcre_exec() without using JIT:      matched by pcre_exec() without using JIT:
254    
255      (a) If the rest of the pattern did not match after a maximal run of      (a) If the rest of the pattern did not match after a maximal run of
256          grapheme clusters, the code for backing up to try with fewer of them          grapheme clusters, the code for backing up to try with fewer of them
257          did not always back up over a full grapheme when characters that do not          did not always back up over a full grapheme when characters that do not
258          have the modifier quality were involved, e.g. Hangul syllables.          have the modifier quality were involved, e.g. Hangul syllables.
259    
260      (b) If the match point in a subject started with modifier character, and      (b) If the match point in a subject started with modifier character, and
261          there was no match, the code could incorrectly back up beyond the match          there was no match, the code could incorrectly back up beyond the match
262          point, and potentially beyond the first character in the subject,          point, and potentially beyond the first character in the subject,
263          leading to a segfault or an incorrect match result.          leading to a segfault or an incorrect match result.
264    
265  10. A conditional group with an assertion condition could lead to PCRE  10. A conditional group with an assertion condition could lead to PCRE
266      recording an incorrect first data item for a match if no other first data      recording an incorrect first data item for a match if no other first data
267      item was recorded. For example, the pattern (?(?=ab)ab) recorded "a" as a      item was recorded. For example, the pattern (?(?=ab)ab) recorded "a" as a
268      first data item, and therefore matched "ca" after "c" instead of at the      first data item, and therefore matched "ca" after "c" instead of at the
269      start.      start.
270    
271  11. Change 40 for 8.33 (allowing pcregrep to find empty strings) showed up a  11. Change 40 for 8.33 (allowing pcregrep to find empty strings) showed up a
272      bug that caused the command "echo a | ./pcregrep -M '|a'" to loop.      bug that caused the command "echo a | ./pcregrep -M '|a'" to loop.
273    
274  12. The source of pcregrep now includes z/OS-specific code so that it can be  12. The source of pcregrep now includes z/OS-specific code so that it can be
275      compiled for z/OS as part of the special z/OS distribution.      compiled for z/OS as part of the special z/OS distribution.
276    
277  13. Added the -T and -TM options to pcretest.  13. Added the -T and -TM options to pcretest.
278    
279  14. The code in pcre_compile.c for creating the table of named capturing groups  14. The code in pcre_compile.c for creating the table of named capturing groups
280      has been refactored. Instead of creating the table dynamically during the      has been refactored. Instead of creating the table dynamically during the
281      actual compiling pass, the information is remembered during the pre-compile      actual compiling pass, the information is remembered during the pre-compile
282      pass (on the stack unless there are more than 20 named groups, in which      pass (on the stack unless there are more than 20 named groups, in which
283      case malloc() is used) and the whole table is created before the actual      case malloc() is used) and the whole table is created before the actual
284      compile happens. This has simplified the code (it is now nearly 150 lines      compile happens. This has simplified the code (it is now nearly 150 lines
285      shorter) and prepared the way for better handling of references to groups      shorter) and prepared the way for better handling of references to groups
286      with duplicate names.      with duplicate names.
287    
288  15. A back reference to a named subpattern when there is more than one of the  15. A back reference to a named subpattern when there is more than one of the
289      same name now checks them in the order in which they appear in the pattern.      same name now checks them in the order in which they appear in the pattern.
290      The first one that is set is used for the reference. Previously only the      The first one that is set is used for the reference. Previously only the
291      first one was inspected. This change makes PCRE more compatible with Perl.      first one was inspected. This change makes PCRE more compatible with Perl.
292    
293  16. Unicode character properties were updated from Unicode 6.3.0.  16. Unicode character properties were updated from Unicode 6.3.0.
294    
295  17. The compile-time code for auto-possessification has been refactored, based  17. The compile-time code for auto-possessification has been refactored, based
296      on a patch by Zoltan Herczeg. It now happens after instead of during      on a patch by Zoltan Herczeg. It now happens after instead of during
297      compilation. The code is cleaner, and more cases are handled. The option      compilation. The code is cleaner, and more cases are handled. The option
298      PCRE_NO_AUTO_POSSESSIFY is added for testing purposes, and the -O and /O      PCRE_NO_AUTO_POSSESS is added for testing purposes, and the -O and /O
299      options in pcretest are provided to set it.      options in pcretest are provided to set it. It can also be set by
300        (*NO_AUTO_POSSESS) at the start of a pattern.
301  18. The character VT has been added to the set of characters that match \s and  
302      are generally treated as white space, following this same change in Perl  18. The character VT has been added to the default ("C" locale) set of
303      5.18. There is now no difference between "Perl space" and "POSIX space".      characters that match \s and are generally treated as white space,
304        following this same change in Perl 5.18. There is now no difference between
305  19. The code for checking named groups as conditions, either for being set or      "Perl space" and "POSIX space". Whether VT is treated as white space in
306        other locales depends on the locale.
307    
308    19. The code for checking named groups as conditions, either for being set or
309      for being recursed, has been refactored (this is related to 14 and 15      for being recursed, has been refactored (this is related to 14 and 15
310      above). Processing unduplicated named groups should now be as fast at      above). Processing unduplicated named groups should now be as fast at
311      numerical groups, and processing duplicated groups should be faster than      numerical groups, and processing duplicated groups should be faster than
312      before.      before.
313    
314  20. Two patches to the CMake build system, by Alexander Barkov:  20. Two patches to the CMake build system, by Alexander Barkov:
315    
316        (1) Replace the "source" command by "." in CMakeLists.txt because        (1) Replace the "source" command by "." in CMakeLists.txt because
317            "source" is a bash-ism.            "source" is a bash-ism.
318    
319        (2) Add missing HAVE_STDINT_H and HAVE_INTTYPES_H to config-cmake.h.in;        (2) Add missing HAVE_STDINT_H and HAVE_INTTYPES_H to config-cmake.h.in;
320            without these the CMake build does not work on Solaris.            without these the CMake build does not work on Solaris.
321    
322  21. Perl has changed its handling of \8 and \9. If there is no previously  21. Perl has changed its handling of \8 and \9. If there is no previously
323      encountered capturing group of those numbers, they are treated as the      encountered capturing group of those numbers, they are treated as the
324      literal characters 8 and 9 instead of a binary zero followed by the      literal characters 8 and 9 instead of a binary zero followed by the
325      literals. PCRE now does the same.      literals. PCRE now does the same.
326    
327  22. Following Perl, added \o{} to specify codepoints in octal, making it  22. Following Perl, added \o{} to specify codepoints in octal, making it
328      possible to specify values greater than 0777 and also making them      possible to specify values greater than 0777 and also making them
329      unambiguous.      unambiguous.
330    
331  23. Perl now gives an error for missing closing braces after \x{... instead of  23. Perl now gives an error for missing closing braces after \x{... instead of
332      treating the string as literal. PCRE now does the same.      treating the string as literal. PCRE now does the same.
333    
334  24. RunTest used to grumble if an inappropriate test was selected explicitly,  24. RunTest used to grumble if an inappropriate test was selected explicitly,
335      but just skip it when running all tests. This make it awkward to run ranges      but just skip it when running all tests. This make it awkward to run ranges
336      of tests when one of them was inappropriate. Now it just skips any      of tests when one of them was inappropriate. Now it just skips any
337      inappropriate tests, as it always did when running all tests.      inappropriate tests, as it always did when running all tests.
338    
339  25. If PCRE_AUTO_CALLOUT and PCRE_UCP were set for a pattern that contained  25. If PCRE_AUTO_CALLOUT and PCRE_UCP were set for a pattern that contained
340      character types such as \d or \w, too many callouts were inserted, and the      character types such as \d or \w, too many callouts were inserted, and the
341      data that they returned was rubbish.      data that they returned was rubbish.
342    
343  26. In UCP mode, \s was not matching two of the characters that Perl matches,  26. In UCP mode, \s was not matching two of the characters that Perl matches,
344      namely NEL (U+0085) and MONGOLIAN VOWEL SEPARATOR (U+180E), though they      namely NEL (U+0085) and MONGOLIAN VOWEL SEPARATOR (U+180E), though they
345      were matched by \h. The code has now been refactored so that the lists of      were matched by \h. The code has now been refactored so that the lists of
346      the horizontal and vertical whitespace characters used for \h and \v (which      the horizontal and vertical whitespace characters used for \h and \v (which
347      are defined only in one place) are now also used for \s.      are defined only in one place) are now also used for \s.
348    
349  27. Add JIT support for the 64 bit TileGX architecture.  27. Add JIT support for the 64 bit TileGX architecture.
350      Patch by Jiong Wang (Tilera Corporation).      Patch by Jiong Wang (Tilera Corporation).
351    
352  28. Possessive quantifiers for classes (both explicit and automatically  28. Possessive quantifiers for classes (both explicit and automatically
353      generated) now use special opcodes instead of wrapping in ONCE brackets.      generated) now use special opcodes instead of wrapping in ONCE brackets.
354    
355  29. Whereas an item such as A{4}+ ignored the possessivenes of the quantifier  29. Whereas an item such as A{4}+ ignored the possessivenes of the quantifier
356      (because it's meaningless), this was not happening when PCRE_CASELESS was      (because it's meaningless), this was not happening when PCRE_CASELESS was
357      set. Not wrong, but inefficient.      set. Not wrong, but inefficient.
358    
359  30. Updated perltest.pl to add /u (force Unicode mode) when /W (use Unicode  30. Updated perltest.pl to add /u (force Unicode mode) when /W (use Unicode
360      properties for \w, \d, etc) is present in a test regex. Otherwise if the      properties for \w, \d, etc) is present in a test regex. Otherwise if the
361      test contains no characters greater than 255, Perl doesn't realise it      test contains no characters greater than 255, Perl doesn't realise it
362      should be using Unicode semantics.      should be using Unicode semantics.
363    
364  31. Upgraded the handling of the POSIX classes [:graph:], [:print:], and  31. Upgraded the handling of the POSIX classes [:graph:], [:print:], and
365      [:punct:] when PCRE_UCP is set so as to include the same characters as Perl      [:punct:] when PCRE_UCP is set so as to include the same characters as Perl
366      does in Unicode mode.      does in Unicode mode.
367    
368  32. Added the "forbid" facility to pcretest so that putting tests into the  32. Added the "forbid" facility to pcretest so that putting tests into the
369      wrong test files can sometimes be quickly detected.      wrong test files can sometimes be quickly detected.
370    
371  33. There is now a limit (default 250) on the depth of nesting of parentheses.  33. There is now a limit (default 250) on the depth of nesting of parentheses.
372      This limit is imposed to control the amount of system stack used at compile      This limit is imposed to control the amount of system stack used at compile
373      time. It can be changed at build time by --with-parens-nest-limit=xxx or      time. It can be changed at build time by --with-parens-nest-limit=xxx or
374      the equivalent in CMake.      the equivalent in CMake.
375    
376  34. Character classes such as [A-\d] or [a-[:digit:]] now cause compile-time  34. Character classes such as [A-\d] or [a-[:digit:]] now cause compile-time
377      errors. Perl warns for these when in warning mode, but PCRE has no facility      errors. Perl warns for these when in warning mode, but PCRE has no facility
378      for giving warnings.      for giving warnings.
379    
380  35. Change 34 for 8.13 allowed quantifiers on assertions, because Perl does.  35. Change 34 for 8.13 allowed quantifiers on assertions, because Perl does.
381      However, this was not working for (?!) because it is optimized to (*FAIL),      However, this was not working for (?!) because it is optimized to (*FAIL),
382      for which PCRE does not allow quantifiers. The optimization is now disabled      for which PCRE does not allow quantifiers. The optimization is now disabled
383      when a quantifier follows (?!). I can't see any use for this, but it makes      when a quantifier follows (?!). I can't see any use for this, but it makes
384      things uniform.      things uniform.
385    
386  36. Perl no longer allows group names to start with digits, so I have made this  36. Perl no longer allows group names to start with digits, so I have made this
387      change also in PCRE. It simplifies the code a bit.      change also in PCRE. It simplifies the code a bit.
388    
389    37. In extended mode, Perl ignores spaces before a + that indicates a
390        possessive quantifier. PCRE allowed a space before the quantifier, but not
391        before the possessive +. It now does.
392    
393    38. The use of \K (reset reported match start) within a repeated possessive
394        group such as (a\Kb)*+ was not working.
395    
396    40. Document that the same character tables must be used at compile time and
397        run time, and that the facility to pass tables to pcre_exec() and
398        pcre_dfa_exec() is for use only with saved/restored patterns.
399    
400    41. Applied Jeff Trawick's patch CMakeLists.txt, which "provides two new
401        features for Builds with MSVC:
402    
403        1. Support pcre.rc and/or pcreposix.rc (as is already done for MinGW
404           builds). The .rc files can be used to set FileDescription and many other
405           attributes.
406    
407        2. Add an option (-DINSTALL_MSVC_PDB) to enable installation of .pdb files.
408           This allows higher-level build scripts which want .pdb files to avoid
409           hard-coding the exact files needed."
410    
411    42. Added support for [[:<:]] and [[:>:]] as used in the BSD POSIX library to
412        mean "start of word" and "end of word", respectively, as a transition aid.
413    
414    43. A minimizing repeat of a class containing codepoints greater than 255 in
415        non-UTF 16-bit or 32-bit modes caused an internal error when PCRE was
416        compiled to use the heap for recursion.
417    
418    44. Got rid of some compiler warnings for unused variables when UTF but not UCP
419        is configured.
420    
421    
422  Version 8.33 28-May-2013  Version 8.33 28-May-2013

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